[1] Guangxi Med Univ, Affiliated Hosp 1, Dept Med Examinat & Hlth Management, Nanning, Guangxi, Peoples R China
[2] Guangxi Key Lab Precis Med Cardiocerebrovasc Dis, Nanning, Guangxi, Peoples R China
[3] Guangxi Clin Res Ctr Cardiocerebrovasc Dis, Nanning, Guangxi, Peoples R China
[4] Guangxi Med Univ, Affiliated Hosp 1, Elderly Cardiol Ward, Nanning, Guangxi, Peoples R China
[5] Guangxi Med Univ, Affiliated Hosp 1, Elderly Comprehens Ward, Nanning, Guangxi, Peoples R China
[6] Duke Univ, Sch Med, Dept Populat Hlth Sci, Durham, NC 27708 USA